TPR tapped into cold

[Shawn Rowe]

Has anyone seen this set up before?

[gkoehl]

Thankfully- NO
What in the world is the cold water loop for?

[Shawn Rowe]

Good question...two water heaters set up the same way. I can't figure out the installation logic.

[Michael W. Gault]

Originally Posted by srowe

Good question...two water heaters set up the same way. I can't figure out the installation logic.

The logic was faulty - recommend repairs by a licensed plumbing contractor...

[tdietrich1]

Looks like M.C. Escher did some plumbing too.

tom

[rshuey]

Thats an extreme recycling program

[Michael Larson]

Originally Posted by srowe

Has anyone seen this set up before?

WAtts pressure relief valve. It takes the place of an expansion tank. It is installed correctly.

See this LINK

[Russel Ray]

Originally Posted by tdietrich1

Looks like M.C. Escher did some plumbing too.

Oh, that was a margarita ASNR.

[Russel Ray]

I think Michael's got it right.

[dchew]

Wouldn't been easier and better to install a pressure regulator at the outside shutoff valve? The water heaters are protected, but the rest of the plumbing is see the higher pressure in the line.

[Michael Larson]

Originally Posted by dchew

Wouldn't been easier and better to install a pressure regulator at the outside shutoff valve? The water heaters are protected, but the rest of the plumbing is see the higher pressure in the line.

The whole system is protected. The hot and cold side are not isolated from each other. They meet in the water heater tank.

[Harold E. Miller]

Originally Posted by mlarson

WAtts pressure relief valve. It takes the place of an expansion tank. It is installed correctly.

See this LINK

The installation instruction on the watts valve above does not show this configuration...or at least maybe I missed it.
Any how the question I have is how would this work?
We can not see from the picture where the TPR drain line goes to, but if it is tee'd into a supply line, then there is nothing to keep the water from flowing out of the drain line. Obviously I am missing something.

[tdietrich1]

Originally Posted by hmiller

Obviously I am missing something.

I think I understand what you mean. I don't argue this is a pressure only relief, but I wonder if its installation is correct. Meaning, whey do both the tpr and the pr both connect to the same tail? Is this OK?

tom

[Blaine Wiley]

That is allowed, and common in this jurisdiction. The expansion valve takes the place of the expansion tank and drains into the overflow pipe from the TPR valve.

Until the AHJ writes it up here as a faulty install, I won't call it out.

[Michael W. Gault]

Originally Posted by mlarson

WAtts pressure relief valve. It takes the place of an expansion tank. It is installed correctly.

See this LINK

Looks closest to the model 3L which is for Gas water heaters with a seperate gas shutoff to protect from overtemps.(not an exact match)

Looks like a standard TPV valve plumbed back into the cold side. I can't see the tail below the upward 90 but I've never seen this configuration.

Still would defer it...